scholarly journals Synthesis of New Single CFOA-Based VCOs Incorporating the Voltage Summing Property of Analog Multipliers

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
S. S. Gupta ◽  
D. R. Bhaskar ◽  
R. Senani
Keyword(s):  
Operational Amplifier ◽  
Experimental Results ◽  
Control Voltage ◽  
Analog Multiplier ◽  
Current Feedback ◽  
Voltage Controlled Oscillators ◽  
State Variable ◽  
Analog Multipliers ◽  
Current Feedback Operational Amplifier

Recently, current feedback operational amplifier (CFOA) and analog multiplier-(AM-) based-voltage controlled oscillators (VCOs) have been published in the literature which require 2 CFOAs and 2 AMs for linear tuning law between control voltage and frequency of oscillation. In this paper, a family of eight new voltage-controlled oscillators (VCOs), with linear tuning laws, employing only a single CFOA in conjunction with two analog multipliers (AMs), has been derived through a systematic state-variable methodology. This has been made possible by exploiting the voltage summing property of the multiplier chosen which has never been done in the literature earlier. The workability of the presented VCOs has been verified by experimental results based on AD844 type CFOAs and AD534 type AMs, and the advantages of new circuits over the previously known CFOA-AM-based VCOs have been highlighted.

SYNTHESIS OF LINEAR VCOs: THE STATE-VARIABLE APPROACH

2011 ◽  
Vol 20 (04) ◽  
pp. 587-606 ◽  
Author(s):  
S. S. GUPTA ◽  
D. R. BHASKAR ◽  
R. SENANI ◽  
A. K. SINGH
Keyword(s):  
Operational Amplifier ◽  
Systematic Approach ◽  
External Control ◽  
Control Voltage ◽  
Current Feedback ◽  
State Variable ◽  
Analog Multipliers ◽  
Recent Interest ◽  
Variable Approach ◽  
Current Feedback Operational Amplifier

The paper presents a systematic approach of synthesizing sinusoidal linear VCOs (i.e., an oscillator providing linear tuning law of the type f0 ∝ VC between the oscillation frequency f0 and an external control voltage VC). In view of recent interest on current feedback operational amplifier (CFOA)-based oscillators, the proposed methodology has been demonstrated by deriving a class of linear VCOs employing CFOAs and analog multipliers (AM). The workability of the new VCOs has been established by experimental results of the circuits implemented with commercially available AD844 type CFOAs and AD534 type AMs.

scholarly journals New Quartz Crystal Oscillators Using the Current-Feedback Operational Amplifier

2000 ◽  
Vol 23 (3) ◽  
pp. 131-136 ◽  
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Ahmad Al-Ghazwani
Keyword(s):  
Operational Amplifier ◽  
Quartz Crystal ◽  
Experimental Results ◽  
Current Feedback ◽  
Crystal Oscillators ◽  
Current Feedback Operational Amplifier

New crystal oscillators using the current-feedback operational-amplifier (CFOA) are presented. Each circuit uses one CFOA, a crystal and, at most, five externally connected passive elements. Experimental results are included.

scholarly journals New Grounded-Capacitor Sinusoidal Oscillators Using the Current-Feedback-Amplifier Pole

1998 ◽  
Vol 21 (1) ◽  
pp. 23-32 ◽  
Author(s):  
Muhammad Taher Abuelma’atti ◽  
Husain Abdullah Al-Zaher
Keyword(s):  
Operational Amplifier ◽  
Experimental Results ◽  
Current Feedback ◽  
Sinusoidal Oscillators ◽  
Feedback Amplifier ◽  
Current Feedback Amplifier ◽  
Sinusoidal Oscillator ◽  
Current Feedback Operational Amplifier ◽  
Oscillator Circuits

New current-feedback-operational amplifier (CFOA)-pole-based sinusoidal oscillator circuits are presented. Each circuit uses two CFOAs, two (or three) grounded capacitors and/or resistors. Experimental results are included.

scholarly journals Low-Voltage CMOS Current Feedback Operational Amplifier and Its Application

ETRI Journal ◽  
2007 ◽  
Vol 29 (2) ◽  
pp. 212-218 ◽  
Author(s):  
Soliman A. Mahmoud ◽  
Ahmed H. Madian ◽  
Ahmed M. Soliman
Keyword(s):  
Operational Amplifier ◽  
Low Voltage ◽  
Current Feedback ◽  
Current Feedback Operational Amplifier

scholarly journals A memristor-based chaotic-masking for analog spread-spectrum communication

2019 ◽  
Vol 14 (2) ◽  
pp. 966
Author(s):  
Muhammad Taher Abuelma’atti ◽  
Abdullah Yousef Alnafisa
Keyword(s):  
Spread Spectrum ◽  
Operational Amplifier ◽  
Spread Spectrum Communication ◽  
Current Feedback ◽  
Square Wave ◽  
Chaos Generator ◽  
Current Feedback Operational Amplifier

<span>This paper presents a simple chaotic-masking system. The system uses a chaos generator built around a grounded memristor. The memristor is emulated using the current-feedback operational amplifier (CFOA). At the sending end the signal is masked by adding chaos. At the receiving end the signal is recovered by subtracting the chaos. The performance of proposed system is investigated using sinusoidal and square wave signals.</span>

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